Saddlebag

[Sarah]

When you have a woman in the scissor position, drape your balls over her taint (like a saddle) and let each one of your nuts rest on each of her holes, causing suction on your balls

[Jessica]

a small bag that you fix to the back of your bicycle saddle, or one of a pair of bags that you put over the back of a horse or over the back wheel of a bicycle or motorcycle

[Marquetta]

Each of a pair of bags attached behind the saddle on a horse, bicycle, or motorcycle.